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- A. KAMPP.

7 CONTROLLING VALVE FOR HYDRAULIG PRESSURE. No. 518,149. I Patented Apr.1Q, 1894.

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A. KAMPP.

CONTROLLING VALVE FOR HYDRAULIC PRESSURE.

No. 518,149. Patented Apr. 10, 1 894.

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. A. KAMPF. GON'IROLLING VALVE FOR HYDRAULIC PRESSURE.

No. 518,149. Patented Apr. 10, 1894.

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n15 NATIONAL UTNOGRAI'NXNG COMPANY.

, WASHINGTON. D. c.

UNITED STATES" PATENT OFFICE.

AUGUST KAMPF, OF MAGDEBURG, ASSIGNOR TO THE GRUSONWERK, OFMAGDEBURG-BUCKAU, GERMANY.

CONTROLLING-VALVE FOR HYDRAULIC PRESSURE.

SPECIFICATION forming part of Letters Patent No. 518,149, dated April10, 1894.

Application filed January 28. 1893. Serial No. 460,103- (No mod l.)

. Valves for Hydraulic Presses, of which the following is aspecification.

This invention relates to valves, and pas sages, and means for operatingthe valves that serve to distribute the liquid under pressure tohydraulic presses of the kind or class which have a double-acting,so-called differential, piston. By this arrangementot valveslandmechanism the liquid under pressure which is taken from an accumulatorand conveyed below the Weighted piston to effect the lifting of theload, is usefully conducted back into the accumulator during thedownward movement of the press piston. For this purpose the annularspace above the piston formed by the specially thick piston rod is putin communication with the accumulator when the piston is required todescend so that the load on the piston in conjunction with the downwardpressure of the liquid thereon is greater than the upward pressure ofthe liquid on the lower side of the piston, whereby the said piston iscaused to descend and press the liquid below the same back again intothe accumulator. When the piston is required to be raised, the spaceabove the same is placed in communication with an outflow tube and thespace below the piston remains in communication with the accumulator,whereupon the pressure of liquid prevailing below the piston beinggreater than the load and the frictional resistance together the pistonis caused to ascend.

The present invention also provides for securely holding the piston atany desired height, by simultaneously closing the cylinder spaces aboveand below the piston and thus locking the water in the saidspaces. Thevalves for closing and opening the communications between the presscylinder and the ac cumulator and outflow tube are operated by means ofa single lever.

In the accompanying drawings, Figure 1 represents a longitudinal sectionof a valve box constructed according to the present inis open.

vention, the section being taken on the line mac, Figs. 3 and 4. Fig. 2shows the valve box in elevation. Fig. 3 is a horizontal section on theline yy, Figs. 1 and 2. Fig. 4is aplan view of the box, the cover,lever, and lever axes, hereinafter described, being removed. Fig. 5 is atransverse section on the line 2,2, 2, Fig. 3. Fig. 6 is a longitudinalsection on the line '0, r; Fig. 4, and Fig. 7 is atransverse section onthe line w, w, Fig. 4. Fig. 8 is a arranged three valves B B and B inposi tions indicated in Fig. 4by the heads D, D

and D of the valve rods or stems C, O and,

0 shown in Figs. 1, 5, 6 and 7. The said valves are shown openingdownward. Leak-r ago around the valve rods 0', O 0 is prevented bystuffing boxes E E E mounted in the casing A. The valves are loaded bysprings F, F F p and are thereby forced against their seats when clearof the opening levers hereinafter described. 1

G is a pipe which leads from the accumulator and, as shown in Fig. 6,terminates in the chamber above the valve B. The chamher below the saidvalve communicates by an aperture H, Fig.5, with the chamberbelow thevalve-B and by a pipe F, Figs. 1, 2, 3, 4 and 6 with the press cylinderat a point below the piston thereof. It will thus be seen that the spacebelow the press piston communicates with the accumulator when'the valveB communicates by a channel K, Fig. 1, with the chamber below the valveBi and by a tube L,

Figs. 1 to 4, with the annular space above the piston of the press. Thechamber above the valve B communicates by a channel M, Fig. 7, with theoutflow tube N. All three valvesv are adapted to be opened by a handlever 0, Figs. 1, 2 and 5, which is fixed upon a shaft Q supported inthe cover P of the casing A. On the said shaft Q are fixed a one-armedlever B and a two-armed lever S shown clearly in Fig. 3.

The hand lever O is provided with a down- The chamber above the valve Bwardly projecting short arm 0', Fig. 2, which is connected by a link Twith a lever U, fixed on a shaft V which is likewise supported in thecover P of the casing A. A one-armed lever W, Fig. 3, is fixed on theshaft V. The ends of the lever S are situated above and in line with theheads D D of the spindles C 0 while those of the levers R, W aresituated just above the head D of the spindle O". In the middle positionof the lever O the levers R, S and NV are clear of the said heads D, Dand D as shown in Fig. 1. When however the upper end of the lever O ismoved to the left, the left arm of the lever S presses upon the valverod C and opens the valve 13 at the same time compressing the spring Fthereby opening the communication by way of the channels K and M and thetube L between the annular space above the piston of the press and theoutflow tube N. At the same time the lever W is pressed down by the arm0' of the lever O which acts through the link T, lever U, and shaft V,and opens the valve B, thereby placing the space below the piston of thepress, through the tubes F and G, in communication with the accumulator.While the valves B and B are thus opened, the valve 1? remains closed,as in the described movement of the lever O the right arm of the lever Srecedes still farther from the head D of the valve rod 0 and thecommunication of the accumulator with the space above the piston thusremains interrupted. Therefore the full accumulator pressure nowprevails below the press piston while the liquid in the annular spaceabove the said piston is free to flow ofi through the overflow N.Consequently the piston and with it the load will be raised. When thelever O is brought back to its middle position the valves B, B areclosed by their respective springs F F and thus all three valves areclosed, their heads D D D being clear of the levers S and W. Thecylinder space below the press piston is thus shut off by the valve Bfrom the accumulator, and the space above the piston is shut oif by thevalve B from the accumulator, and by the valve 13 from the outflow tubeN, consequently the liquid in the cylinder is imprisoned both above andbelow the piston and the piston is thus securely maintained at theheight to which it has been brought to rest. ,When the upper end of thelever O is moved to the right beyond the middle position, the lever Bpresses down the valve rod 0' and the right hand arm of the lever Ssimultaneously presses down the valve rod 0 The valves B and B beingthus opened, both ends of the press cylinder are thereby placed incommunication with the accumulator, while the outflow tube N is closedby the valve B The accumulator pressure now prevails above as well asbelow the piston, and as the pressure above the piston in conjunctionwith the load resting on the latter is greater thanthe pressure belowthe piston together with the frictional resistances, the piston movesdownward and forces the liquid underneath it back into the accumulator.Duringa complete up ward and downward stroke therefore of the presspiston only so much liquid under pressure is used as will fill theannular space above the piston. This liquid flows 0E through the pipe Nin the upward movement of the piston.

What I do claim as my invention, and desire to secure by Letters Patent,is-

1. In a hydraulic press, the combination with three passages arranged toestablish communication between the lowerlend of the press cylinder andthe source of power, between the upper end of the press cylinder and thesource of power, and between the upper end of the cylinder and theoverflow; the three valves 13', B and B located in the respectivepassages and a pair of rock shafts having radial armslboth located toengage the valve B and one of said rock shafts having arms respectivelylocated and movable in opposite directions to engage the valves B and Bsubstantially as and for the purpose set forth.

2. The herein described means forcontrolling hydraulicpresses,consisting of passages arranged to establish communicationbetween the source of power and the respective sides of thepress-piston, a passage establishing communication between an overflowand the upper side of the press-piston, power, upper cylinder andoverflow valves controlling the source of power, the passage above thepiston and the overflow respectively, and operating shafts provided withprojections and coupled together, movable in opposite directions, saidprojections being arranged, some to move in one direction intoengagement simultaneously with the power valve and the uppercylindervalve, and others movable in the opposite direction for engagement withsaid power valve and the overflow valve, substantiallyas and for thepurposes explained.

3. In combination with the herein described controlling valve havingsuitable passages and the accumulator, upper cylinder and overflow,valves controlling the same; of the operatin g connections for saidvalves, consisting of the pair of rock-shafts having each an armprojecting in one direction therefrom for engagement respectively withthe accumulator and one of the other of the three valves, and one ofsaid shafts also having a pair of arms projecting oppositely from itsarm first mentioned and adapted respectively to engage said accumulatorvalve and the remaining valve, as and for the purposes explained.

4. In combination with the accumulatorpassage, the upper and lowercylinder-passages communicating with the accumulatorpassage, theoverflow communicating with the upper cylinder, and the accumulator, theoverflow, and the upper cylinder valves arranged to respectively controlthe accumulator passage, the overflow and the communication between theupper cylinder and the accumulator passage; means for controlling saidvalves, consisting of the shafts Q and V, with means for operating them,the lever W on shaft V controlling the accumulator valve, and theof thepair of rock-shafts,

levers R, S on shaft Q the lever S having a pair of arms controllingrespectively the ove r flow and upper cylinder valves, and the lever Rhaving an arm controlling the accumulator valve, substantially as andfor the purposes explained. a

5. In combination with the accumulator passage, the upper and lowercylinder passages communicating with the accumulator passage, theoverflow also oommunicating with the upper cylinder passage, and theaccumulator, the overflow and upper cylinder-valves, respectivelycontrolling the accumulator passage the overflow passage and thecommunication between the upper cylinder and accumulator passage; theherein described means for controlling said valves, consisting Q andV,having turning levers, O, O and U, with the connecting link T whichcause said shafts to oscillate simultaneously, the one-armed lever Wfixed upon the shaft V and projecting over the accumulator valve; andthe levers R, S fixed upon the shaft Q, the lever S having a pair ofarms projecting on one side over said overflow valve, and the uppercylinder valve, and the lever B having an arm projecting from theopposite side over the accumulator valve, allrsubstantially as and forthe purposes set forth.

AUGUST KAMPF.

Witnesses:

KARL E. DETZNER, EMIL KALLNECKER.

